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  • QUALITY ASSURANCE AND RELIABILITY  (3)
  • stiffness method  (1)
  • 1
    Electronic Resource
    Electronic Resource
    THE EVALUATIONS OF CAUCHY PRINCIPAL VALUE INTEGRALS AND WEAKLY SINGULAR INTEGRALS IN BEM AND THEIR APPLICATIONS (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 1017-1028 
    Details
    ISSN: 0029-5981
    Keywords: singular integrals ; Green's functions ; stiffness method ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A new technique is developed to evaluate the Cauchy principal value integrals and weakly singular integrals involved in the boundary integral equations. The boundary element method is then applied to analyse scattering of waves by cracks in a laminated composite plate. The Green's functions are obtained in discrete form through the thickness of the plate using a stiffness method. To circumvent the difficulties associated with the evaluation of hypersingular integrals due to the presence of cracks, the multidomain technique is applied. Numerical computations have shown the accuracy and reliability of the proposed technique. Scattered wave fields for a composite plate with a horizontal crack are computed. The numerical results show that the applications of the technique in non-destructive evaluation of defects is very promising.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
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    Transient response of a laminated composite plate (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Results are presented from an investigation of the effect of layering on transient wave propagation in a laminated cross-ply plate, giving attention to the case of 2D plane strain in the case where a line vertical force is applied on a free surface of the plate; the line may be either parallel or perpendicular to the fibers in a ply. The results are in both the time and frequency domains for the normal stress component in the x direction, at a point on the surface of the plate on which the force is applied. Comparative results are also presented for a homogeneous plate whose properties are the static effective ones, when the number of plies is large.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: In: Review of progress in quantitative nondestructive evaluation. Vol. 11A; Proceedings of the 18th Annual Review, Brunswick, ME, July 28-Aug. 2, 1991 (A93-18576 05-38); p. 145-151.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Ultrasonic characterization of multilayered thick composite plates (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Guided wave propagation in a periodically laminated plate is considered when each lamina is transversely isotropic with its symmetry axis lying in the plane of the graphite-epoxy plate. The dispersion behavior of propagation modes influences the dynamic response and can be used to ultrasonically characterize the mechanical properties of the laminated plate. It is assumed that fibers are oriented at 90 deg to one another in adjacent layers and all the laminae are of equal thickness. Results obtained are in good agreement with exact solutions of previous studies.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: Annual Review of Progress in Quantitative Nondestructive Evaluation; Jul 15, 1990 - Jul 20, 1990; La Jolla, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Guided waves in a multilayered composite and ultrasonic nondestructive evaluation (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Analysis of wave propagation in a laminated composite plate with many layers is made difficult by the anisotropy of the laminae, different lay-ups, many layers and defects in the fabricated plate. A good understanding of the wave field in such a plate without defects is a prerequisite for use of ultrasonic techniques to evaluate the various defects that can substantially reduce the strength and service life of this structure. Results of modeling studies of wave propagation and scattering in a multilayered composite plate are presented. The analysis technique combines the finite element discretization through the thickness with wave form representation along the plate in order to calculate the dispersive modes of propagation in the plate. To study scattering of these waves by a matrix crack that grows into delaminations, a hybrid finite element representation of the field near the crack and the modal representation of the scattered exterior field are used. Results are presented showing the dependence of the reflection and transmission coefficients on the size of the crack with delamination which can be used to size the defect using ultrasonic techniques.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: International Conference on Composite Materials (ICCM/8); Jul 15, 1991 - Jul 19, 1991; Honolulu, HI; United States
    Format: text
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